Push-button switch



Sept. 3, 1929. J H 1,726,897

PUSH BUTTON SWITCH Filed Aug. 1, 1927 Awe/750p.-

Patented Sept. 3, 1929.

UNITED STATES 1,726,897 PATENT OFFICE.

JOHANNES noun, or alarm GERMANY.

PUSH-BUTTON swrrcn.

Application filed August 1, 1927, Serial No.209,836, and in Germany October 12, 1928.

This invention relates to a push-button switch the switch lever of which is reversed at the depressing of the push-button by a tongue arranged in the button. In switches of this type a spring arranged in the pushbutton serves to maintain the movable tongue permanently in the central position, while the tongue is actuated directly by the pushbutton.

According to the invention the spring acting upon the tongue is arranged so that it maintains the tongue in-its central position when the switch is in the position of rest, while the spring is compressed, when the .push button is being operated, so that the spring acts in this state through the intermediarypf the tongue upon the switch lever. As long however as the push-button has not yet assumed its lowest position the switch lever cannot carry out any movement as it is securely held in its position at the same time by a detent connected to the push-button. Only when the push button has arrived in its lowest position and when consequently the spring in the push-button is brought under complete tension the detent releases the switch lever. At this instant the switch lever is thrown to the opposite side by the accumulated energy of the spring.

By this arrangement an absolutely sure sudden switching is obtained in the simplest manner,-the push-button might be depressed slowly or rapidly.

An embodiment of the invention is illustrated, by way of example, in the accompanying drawings, in which: Fig. 1 is a vertical section on line II of Fig. 3, the elements being shown in the position which they assume when the push-button is in the position of rest.

Fig. 2 is a-vertical section on line I-I of Fig. 3' showing the elements in the posit-ion at the deepest depression of the push-button.

Fig. 3 is atop plan view, the feed mechanism beingomitted Fig. 4 is a vertical section on line IIII of Fig. 3. The push-button 1 is hollow and closed at its open end by a plate 2, the edge of which is headed to grip over a flange 3 at the end of the button. The plate 2 has a hole at its centre through which projects a tongue 4. This tongue 4 has at its top end a horizontal plate 5 between which and the top end of the push-button 1 a conically wound spiral spring 6 is enclosed which normally maintains the plate 5 pressed upon the bottom plate 2.

The tongue 4 is thus maintained accurately in the central position. In the base plate 7 made of insulating material a horizontal axle 8 is located on which the switch lever 9 is mounted. The switch lever has at its centre a point 10 the inclined side faces of which merge into curved portions 11 and 12. Opposite point 10 a detent 13 is arranged on the switch lever.

On the free ends of the switch lever 9- insulating pieces 14, 15 respectively are mounted on which the switching elements 16, 17 made of metal are tightly fitted so that the current-conducting elements are electrically separated from the lever mechanism.

A U-shaped bow 18 is fixed on the plate 2 and has two slots 19 and 20 traversed by.

the axle 8. The bow 18 has at its lowerend a nose 21.

The push-button 1 is movable in a cylindrical portion 22 of the base plate 7, the U-shapedbow 18 being guided in apertures 23 and the lever 9 in a slot 24 of the base plate 7. f

The switch elements 16, 17, respectively connect one with the other the current contact elements 25, 26 and 27, 28 respectively. A helical spring 29 is provided and designed to return the push-button 1 into the initial position.

The operation of the switch is as follows:

When the push-button 1 is being depressed the tongue 4 slides on the switch lever 9 on the inclined side of point 10' into the abutment portion 12, the spring 6 being pressed at the same time and the bra e nose 21 of the U-sha ed bow 18 slides along the inclined side 0 the detent 13. When the push-button 1 has assumed its lowest position shown .in Fig. 2 the nose 21 releases the detent 13 and the switch lever 9 can suddenly oscillate into the opposite direction and conmeet the current supplies 27 and 28 by its switch element 17. When the push-button 1 is released, it will be suddenly returned into its initial position so that the tongue 4 i1? returned into its central position shown in When the push-button 1 is depressed again, the switch lever 9 will be oscillated by the tongue 4 into the opposite direction, so that the contacts 25 and 26 are connected by the switch element 16.

The switch described and Shawn is a re:

com-

versing switch; for a simple cut out the extremeportion of the right arm of the switch ing lever 9 and the contacts 27 and 28 might be omitted.

I claim I A push-button switch, comprising in combination a switch lever, a hollow push-button, a push tongue movably mounted in said switch adapted to reverse said switch lever, a push spring in said push button holding said tongue in the central position, a plate having a narrow central opening closing the lower end of said push button, a horizontal plate on said push tongue above said plate, a spiral sprin in said push button pressing said plate 0 said tongue against said plate of said push-button, a locking nose rigid with said push button plate, and a detent for said switch lever controlled by said looking nose. r

In testimony whereof I afiix m signature.

J OHANNE HORN. 

